Study on photoluminescence of thermally treated Bi12GeO20 and Mo:Bi12GeO20 crystals

Authors :: Yu, PingSheng
Su, LiangBi
Tang, HuiLi
Guo, Xin
Zhao, HengYu
Yang, QiuHong
Xu, Jun
Source :: SCIENCE CHINA Technological Sciences; May 2011, Vol. 54 Issue: 5 p1287-1291, 5p
Publication Year :: 2011
Abstract: Abstract: Photoluminescence (PL) of Bi<subscript>12</subscript>GeO<subscript>20</subscript> and Mo doped Bi<subscript>12</subscript>GeO<subscript>20</subscript> (Mo: Bi<subscript>12</subscript>GeO<subscript>20</subscript>) crystals in visible and near-infrared (NIR) spectral regions were studied. X-ray diffraction analysis, absorption and Raman scattering spectra of these crystals were also measured. Pure Bi<subscript>12</subscript>GeO<subscript>20</subscript> after annealing in N<subscript>2</subscript> atmosphere at 450 °C and 550 °C show predominant emissions at about 745 and 1250 nm bands, while the emission peaks of Mo:Bi<subscript>12</subscript>GeO<subscript>20</subscript> crystals untreated or after annealing in Ar at 300 °C are at around 538 and 1165 nm. The results suggest that annealing induces intrinsic luminescence of Bi in pure Bi<subscript>12</subscript>GeO<subscript>20</subscript> at room temperature and Mo influences the luminescence centers of Bi<subscript>12</subscript>GeO<subscript>20</subscript>. The emission peaks of Bi<subscript>12</subscript>GeO<subscript>20</subscript> and Mo: Bi<subscript>12</subscript>GeO<subscript>20</subscript> probably owe to lower-valent Bi ions.

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